Lieutenant. All of the ranks are here http://i185.Photobucket.com/albums/x315/BTHR_Zero_X/Halo%203%20Other%20Pics/ListofobtainableOnlineranks.jpg
luitenent i think
gunnery sergeant... abbreviated GySgt
Officer ranks require you to have a certain XP and highest skill level. For example, to get to the first officer rank, Lieutenant, you need 70 XP and a highest skill of 10. Without the 10 skill, you'd still be a Gunnery Sergeant. To be a 5-star General, you need 5000 XP and a highest skill of 50. If you had 5000 XP, but a highest skill lower than 10, you'd still be a Gunnery Sergeant.
In order to get the light-switch achievement, you must earn the rank of Lieutenant in a playlist. Not to be confused with your overall rank. So yes, you must go through all the sergeant ranks in any particular playlist, but you do not need to go through all the sergeant ranks for your overall rank.
Gunnery Sergeant Buck is a 25 year veteran of the war up to the events of Halo 3 and ODST. He managed to survive Harvest and countless other colonist worlds and even managed to somehow make it off Reach alive. I cannot directly answer the question but taking it since he is a 25 year war veteran and that a Gunnery Sergeant, I would say maybe forties?
Verbal conversations are nearly always General, Colonel, or Lieutenant. Written communications almost always should be Major General, Lieutenant Colonel or 1st Lieutenant.AnswerIn the British Armed Forces, you never address an officer by rank alone. James Bond would never be addressed as "Commander", but as "Commander Bond". Subordinates would never address him by rank; they would simply call him "Sir", never "Commander".
earn it.
Matchmaking
You must get to the rank Luitenant in a game type or for your rank.
rank up to brigadier and buy it for 300,000 credits.
you have to rank up to seargent
Get your overall rank to Lieutenant